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Classification Of Metamorphic Rocks
Ø Metamorphic rocks have been variously classified on the basis of texture and structure, degree of metamorphism, mineralogical composition and mode of origin etc.
Ø A very general two-fold classification based on the presence or absence of layered structure or
FOLIATION as defined above is as follows:
(a) Foliated Rocks
Ø All metamorphic rocks showing development of conspicuous parallelism in their mineralogical and structural constitution falling under the general term foliation are grouped together as foliated rocks.
Ø The parallelism indicating features include slaty cleavage, schistosity and gneissose structures
Ø Typical rocks included in this group are slates, phyllites, schists and gneisses of great variety.
Ø Included in this group are all those metamorphic rocks characterised with total or nearly total absence of foliation or parallelism of mineralogicaJ constituents.
Ø Typical examples of non-foliated rocks are quartzites, hornfels, marbles, amphibolites and soapstone etc.
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